THIS PRODUCT MAY ONLY BE SHIPPED VIA FEDEX OR UPS GROUND. You must choose Ground as your shipping method. Gamvar Picture Varnish by Gamblin is a low molecular weight synthetic-resin gloss varnish developed by conservation scientists at the National Gallery. Gamvar Picture Varnish has a high refractive index similar to that of natural resins such a Dammar. This high light refraction bring out the best in the painting, making it "pop". The colors will appear more saturated. Unlike varnishes made from natural resins like damar and mastic, Gamvar does not yellow with age or become more difficult to remove. It contains a UV stabilizer that can help keep less lightfast pigments from fading. The Thicker it is applied, the more UV protection it will provide. The 16.9 fluid ounce pre-mixed Gamvar Picture Varnish is ready to use right out of the jar and will cover up to 320 square feet.